What is the difference between let, const, and var?

'let' and 'const' are modern block-scoped variables, where 'const' cannot be reassigned. 'var' is older, function-scoped, and prone to hoisting bugs.

What is the DOM in JavaScript?

The Document Object Model (DOM) is a programming interface for web documents. It represents the page so that JavaScript can change the document structure, style, and content.

What are arrow functions?

Arrow functions provide a shorter syntax for writing functions in JavaScript (e.g., () => {}). They also do not bind their own 'this' context, which is useful in object-oriented programming.